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6. Which plate contains pore pairs?

  • Genital plate
  • Interambulacral plate
  • Ambulacral plate
  • Ocular plate

7. What is the function of 'Aristotle's lantern'?

  • To scrape algae or other food towards the gut
  • To allow water into the madreporite
  • To filter sediment that enters the mouth
  • To attach the spine to the boss

8. What is the function of the water vascular system?

  • To release sperm and eggs into the water column
  • Allows the animals to extend its tube feet by forcing water into the controlled tissues
  • To allow fresh water to pass through the animals and dispose of dirty water

9. What is the function of the Labrum?

  • To aid respiration and and maintaining the burrow and anal tube
  • For spine attachment, allowing them to dig burrows
  • A 'lip' protruding over part of the mouth to prevent sediment moving into the mouth
  • To direct waste particles to the sanitary tube

10. What is the function of the plastron?

  • To respire by gas exchange
  • An area of attachment for small spines to dig burrows
  • For tube feet attachment for digging

11. What is the function of the Fascioles?

  • They prevent sediment entering the test through small holes
  • To direct water to the mouth and to direct waste away from the echinoid
  • They have no real purpose
  • They attach the spine to the boss

12. What is the function of tube feet?

  • For defence, support and attachment
  • For defence, movement and feeding
  • For attachment, movement and respiration
  • For respiration, movement and feeding

13. What is the function of the Tubercle?

  • For respiration and movement
  • For spine attachment
  • To allow the tube feet to protrude

14. What is the function of the Genital plate?

  • To release sperm and eggs into water column
  • To give birth
  • To contract and cause the spine to move in a coordinated manner
  • To allow echinoids to mate